Phys. Rev. B 63, 184509 (2001) [5 pages]Effect of controlled disorder on quasiparticle thermal transport in Bi2Sr2CaCu2O8 |
S. Nakamae, K. Behnia, and L. Balicas *
Laboratoire de Physique Quantique (UPR 5 CNRS), ESPCI, 75005 Paris, France
F. Rullier-Albenque
Service de Physique de l’Etat Condensé, CEA-Saclay, 91011 Gif-sur-Yvette, France
H. Berger
Départment de Physique, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
T. Tamegai
Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
Received 7 December 2000; published 18 April 2001
Low-temperature thermal conductivity κ of optimally doped Bi2Sr2CaCu2O8 was studied before and after the introduction of point defects by electron irradiation. The amplitude of the linear component of κ remains unchanged, confirming the universal nature of heat transport by zero-energy quasiparticles. The induced decrease in the absolute value of κ at finite temperatures allows us to resolve a nonuniversal term in κ due to conduction by finite-energy quasiparticles. The magnitude of this term provides an estimate of the quasiparticle lifetime at subkelvin temperatures.
©2001 The American Physical Society
URL: http://link.aps.org/abstract/PRB/v63/e184509
DOI: 10.1103/PhysRevB.63.184509
PACS: 74.72.Bk, 72.15.Eb, 74.25.Fy
* On leave from Centro de Física, Instituto Venezolano de Investigaciones Cientícas, Venezuela.
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